Usually it works the other way around, but it would appear that Prince Charles serves as a solid example of a child who manages to embarrass his own parents.
Admittedly, he is 69 years old himself and perfectly capable of embarrassing his own children, you'd imagine, but The Queen rolled her eyes and tutted at him when he referred to her as 'Your Majesty' and - even worse - 'Mummy' at the monarch's 92nd birthday celebrations.
The star-studded show that took place at the Royal Albert Hall featured artists from around the commonwealth such as Shaggy, Kylie Minogue, and Sir Tom Jones.
As the show was drawing to a conclusion, Britain's longest-serving monarch and longest-serving Prince of Wales took to the stage, flanked by the musicians that had entertained the crowd.
Prince Charles gave a speech dedicated to his mother, in which he said: "I have a feeling that in 1948 when you were 22, you didn't somehow expect at your 92nd birthday to find your son in his 70th year - just able still to raise a small 'hip, hip'.
"Would you all give Her Majesty three unbelievably rousing cheers on her birthday?"
Obviously, being slavishly devoted subjects - well, enough to want tickets to the Queen's birthday bash, anyway - the crowd responded. The Queen gave them a bit of a wave to acknowledge them, but tutted and rolled her eyes when he switched to the less formal 'Mummy'.
I mean, OK, she is his mother, but still - who calls their mum 'Mummy' anyway?
Wedding watchers - Prince Harry and Meghan Markle were there as well, and Harry also took to the stage to give tribute to his gran.
He said: "Tonight we are celebrating the Queen's Birthday but Your Majesty, if you do not mind me saying, you are not someone who is easy to buy gifts for."
We don't know exactly what he did get for her, but Lizzie recently gave him a present, in the form of a new job as head of The Queen's Commonwealth Trust.
He used his speech to talk of the work that The Queen has put into the Commonwealth, and the work he hopes to do.
He continued: "As we celebrate your 92nd birthday this evening and in recognition of your incredible life of service, I am delighted to say that the Queen's Commonwealth Trust has now been launched to support young leaders around the Commonwealth.
"This organisation, in your name, will provide a platform for those working to make a difference in their communities across 53 countries. Happy Birthday Your Majesty."
Rousing stuff, I'm sure you'll agree.
Featured Image Credit: PATopics: Prince Charles, UK News, The Queen